From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 8829742B3C for ; Sat, 25 Jun 2022 04:33:21 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id DF79B68B766; Sat, 25 Jun 2022 07:33:17 +0300 (EEST) Received: from mail-ed1-f47.google.com (mail-ed1-f47.google.com [209.85.208.47]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 4379668B444 for ; Sat, 25 Jun 2022 07:33:11 +0300 (EEST) Received: by mail-ed1-f47.google.com with SMTP id o10so6023795edi.1 for ; Fri, 24 Jun 2022 21:33:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=O134tbOQJNNpu6Ti2CF3CTxNamt9dpWI13Zmhw0fIpw=; b=d43KzaQ7sMCHzLuWs9y7KpHd0m+LZuU/QI/037p5TrGqZiALIsiaA6Dh7HCORj62U9 O/wLW7+1Tg3ohbVFDxG+23i89hOveHxMKTpnr5zsIkCvdxVFwF4Se4eEXg1n17GO8aEa u23q1fSOkiK50MfqBx+eMqrE//nfTW4h3DJWzlGa6NusTxVGutBvYWek4QJBnjmsmoRe kBFvxBYoimnCdfU+gmMjA7q7x/+xEMbpm3HqC1QkF0GJPwMApE24cz/QhU1smHPVBku3 HSEfo190pi06OVRPCybxyHLyCY5Axq7VB5rEooEVzdycL5wNVxp2rSdIQkGCKiT+UDZG asIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=O134tbOQJNNpu6Ti2CF3CTxNamt9dpWI13Zmhw0fIpw=; b=fshpWN60R5x95zXGtKHa5/ljwGJaO1fGQKCnTmDsWiG8lHai5Qb06bpBk34+0AjYHC akiqDZY1IabcjuzkjqXTRzazXH7yKQ1sFUl1mPQShFhuXqkbsNzNB9Q1prWNCfT3dXOi mecWG8ke7YpIY5y2EA6FFqBgU7HnWgK0SnCEo6UjsYX+lo1Nhhq/tZxI7beEweTDYxsx h3OaEppDIj71KkfMvEOUlNfmm35lz8XZVBCgIySXFqMJBpjdHsiJbiWDF7KmcaybYiHv R1ifNHts6/ZoZYpZozZcmN3kjLxRQmWL5nYrnjhXlPvS0CklhyI9eTzaNsR1OE+0jWIg DNIA== X-Gm-Message-State: AJIora8Xtk3MJOjnfA1b8xbIBoBJrvEEEzBOuAGdApjuSv0fbt1n92Mu +MvsH3WkCNZRUrnOj0elJqwwrk/T5lQNLxO+9Rs= X-Google-Smtp-Source: AGRyM1t5UO2v/QDe0VC8ubx6/jxMrdBE+dEMEiAcK1gl4CuW0Cq0S1arAJsCMgHllvmRaCvPy+Te/G2xV+LqzPzekg8= X-Received: by 2002:a05:6402:f1b:b0:436:d3c4:aef2 with SMTP id i27-20020a0564020f1b00b00436d3c4aef2mr3077896eda.27.1656131590389; Fri, 24 Jun 2022 21:33:10 -0700 (PDT) MIME-Version: 1.0 References: <20220623150040.1981341-1-wolfleekay@gmail.com> In-Reply-To: From: =?UTF-8?B?5bCR5a6H5p2O?= Date: Sat, 25 Jun 2022 12:32:58 +0800 Message-ID: To: Steven Liu Content-Type: multipart/mixed; boundary="000000000000259e8f05e23e2fa0" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 Subject: Re: [FFmpeg-devel] [PATCH] avformat/hls:use EXT-X-START instead of live_start_index if it's in playlist X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: --000000000000259e8f05e23e2fa0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Steven, Please review code. I changed code, but I still have a question. If EXT-X-START tag in playlist and users set live_start_index, the live_start_index will not work for current codes, which makes maybe users confused. Is that OK? In other hand, if make live_start_index valid when EXT-X-START tag in playlist, maybe live_start_index needs a flag, or make live_start_index default value is INT_MIN to distinguish. becuase the live_start_index default value is -3, I have no idea to distinguish users action or default value when live_start_index=3D-3. May I need to set default value=3DINT_MIN as live_start_index default value= ? And only when does not exist EXT-X-START tag in playlist, make live_start_index =3D -3 or users's configuration valu= e. I have no idea which is better~ Thanks a lot! Steven Liu =E4=BA=8E2022=E5=B9=B46=E6=9C=8824=E6= =97=A5=E5=91=A8=E4=BA=94 14:21=E5=86=99=E9=81=93=EF=BC=9A > =E5=B0=91=E5=AE=87=E6=9D=8E =E4=BA=8E2022=E5=B9=B4= 6=E6=9C=8824=E6=97=A5=E5=91=A8=E4=BA=94 11:58=E5=86=99=E9=81=93=EF=BC=9A > >> > >> > >> Hi, Steven > > > > > > I got it. > > > > User could use "live_start_index" option even if #EXT-X-START in the > playlist. > > > > I changed the priority about #EXT-X-START/live_start_index, > > > > this is new bellow: > > > > --- > > libavformat/hls.c | 69 +++++++++++++++++++++++++++++++++++++++++++---- > > 1 file changed, 64 insertions(+), 5 deletions(-) > > > > diff --git a/libavformat/hls.c b/libavformat/hls.c > > index b736f093a9..309471efce 100644 > > --- a/libavformat/hls.c > > +++ b/libavformat/hls.c > > @@ -120,6 +120,8 @@ struct playlist { > > enum PlaylistType type; > > int64_t target_duration; > > int64_t start_seq_no; > > + int time_offset_flag; > > + int64_t start_time_offset; > > int n_segments; > > struct segment **segments; > > int needed; > > @@ -741,6 +743,7 @@ static int parse_playlist(HLSContext *c, const char > *url, > > struct segment **prev_segments =3D NULL; > > int prev_n_segments =3D 0; > > int64_t prev_start_seq_no =3D -1; > > + const char *p; > > > > if (is_http && !in && c->http_persistent && c->playlist_pb) { > > in =3D c->playlist_pb; > > @@ -889,6 +892,18 @@ static int parse_playlist(HLSContext *c, const cha= r > *url, > > cur_init_section->key =3D NULL; > > } > > > > + } else if (av_strstart(line, "#EXT-X-START:", &ptr)) { > > + ret =3D ensure_playlist(c, &pls, url); > > + if (ret < 0) { > > + goto fail; > > + } > > + if (av_strstart(ptr, "TIME-OFFSET=3D", &p)) { > > + float offset =3D strtof(p, NULL); > > + pls->start_time_offset =3D offset * AV_TIME_BASE; > > + pls->time_offset_flag =3D 1; > > + } else { > > + goto fail; > > + } > > } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { > > if (pls) > > pls->finished =3D 1; > > @@ -1721,10 +1736,54 @@ static int64_t select_cur_seq_no(HLSContext *c, > struct playlist *pls) > > > > /* If this is a live stream, start live_start_index segments > from the > > * start or end */ > > - if (c->live_start_index < 0) > > - return pls->start_seq_no + FFMAX(pls->n_segments + > c->live_start_index, 0); > > - else > > - return pls->start_seq_no + FFMIN(c->live_start_index, > pls->n_segments - 1); > > + if (c->live_start_index !=3D INT_MIN) { > Maybe you should not change current logic. > You can just add about process EXT-X-START sence,. > For example: > compute the start_seq_no and save the value to a temp varible and > don't return immediately, check the third scence which get EXT-X-START > tag from playlist. > process the temp varible after start_seq_no compute from > live_start_index or EXT-X-START. > > > + if (c->live_start_index < 0) > > + return pls->start_seq_no + FFMAX(pls->n_segments + > > + c->live_start_index, 0= ); > > + else > > + return pls->start_seq_no + FFMIN(c->live_start_index, > > + pls->n_segments - 1); > > + } else if (c->live_start_index =3D=3D INT_MIN && > !pls->time_offset_flag) { > > + return pls->start_seq_no + FFMAX(pls->n_segments - 3, 0); > > + } else { > > + /* If playlist indicate a TIME-OFFSET and user not use > live_start_index, > > + * need to recalculate seq_no */ > > + int i; > > + int64_t start_timestamp; > > + int64_t playlist_duration =3D 0; > > + int64_t cur_timestamp =3D c->cur_timestamp =3D=3D AV_NOPTS= _VALUE > ? 0 : > > + c->cur_timestamp; > > + > > + for (i =3D 0; i < pls->n_segments; i++) { > > + playlist_duration +=3D pls->segments[i]->duration; > > + } > > + /* If the absolute value of TIME-OFFSET exceeds > > + * the duration of the playlist, it indicates either the > end of the > > + * playlist (if positive) or the beginning of the playlist > (if > > + * negative). */ > > + if (pls->start_time_offset >=3D0 && > > + pls->start_time_offset > playlist_duration) > > + start_timestamp =3D cur_timestamp + playlist_duration; > > + else if (pls->start_time_offset >=3D 0 && > > + pls->start_time_offset <=3D playlist_duration) > > + start_timestamp =3D cur_timestamp + > pls->start_time_offset; > > + else if (pls->start_time_offset < 0 && > > + pls->start_time_offset < -playlist_duration) > > + start_timestamp =3D cur_timestamp; > > + else if (pls->start_time_offset < 0 && > > + pls->start_time_offset > -playlist_duration) > > + start_timestamp =3D cur_timestamp + playlist_duration = + > > + pls->start_time_offset; > > + else > > + start_timestamp =3D cur_timestamp; > > + > > + find_timestamp_in_playlist(c, pls, start_timestamp, > &seq_no, NULL); > > + av_log(c, AV_LOG_DEBUG, "start_timestamp: %" PRId64 > > + "cur_timestamp:%" PRId64 > > + "cur_seq_no:%" PRId64 "\n", > > + start_timestamp, cur_timestamp, > seq_no); > > + return seq_no; > > + } > > } > > > > /* Otherwise just start on the first segment. */ > > @@ -2475,7 +2534,7 @@ static int hls_probe(const AVProbeData *p) > > #define FLAGS AV_OPT_FLAG_DECODING_PARAM > > static const AVOption hls_options[] =3D { > > {"live_start_index", "segment index to start live streams at > (negative values are from the end)", > > - OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 =3D -3}, > INT_MIN, INT_MAX, FLAGS}, > > + OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 =3D INT_MIN}, > INT_MIN, INT_MAX, FLAGS}, > This is unnecessary=EF=BC=8C because the default -3 is ok and be using by > users from many years ago. > > > {"allowed_extensions", "List of file extensions that hls is allowe= d > to access", > > OFFSET(allowed_extensions), AV_OPT_TYPE_STRING, > > {.str =3D > "3gp,aac,avi,ac3,eac3,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,= mpegts,ogg,ogv,oga,ts,vob,wav"}, > > -- > > 2.24.1 (Apple Git-126) > > > > > > Thanks Steven > --000000000000259e8f05e23e2fa0 Content-Type: text/x-patch; charset="US-ASCII"; name="0001-avformat-hls-use-EXT-X-START-instead-of-live_start_i.patch" Content-Disposition: attachment; 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